Shell-model Monte Carlo studies of fp-shell nuclei

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We study the gross properties of even-even and N=Z nuclei with A=48-64 using shell-model Monte Carlo methods. Our calculations account for all 0 ℏ ω configurations in the fp-shell and employ the modified Kuo-Brown interaction KB3. We find good agreement with data for masses and total B(E2) strengths, the latter employing effective charges eₚ=1.35e and eₙ=0.35e. The calculated total Gamow-Teller strengths agree consistently with the B(GT+)-values deduced from (n,p) data if the shell model results are renormalized by 0.64, as has already been established for sd-shell nuclei. The present calculations therefore suggest that this renormalization (i.e., gₐ=1 in the nuclear medium) is universal.